Some days ago I bought three paint testers to do my wood trims and doors. The pots are this size:
I reckoned three would do it all. I did check the label to see how much was in them because I was working out the price of those versus the smallest (large) tin that the paint comes in. These contain 50ml.
Obviously the price was extortionate per ml compared to a proper tin but it was still false economy to buy the big one when I would never use it any way. I am not sure now where the break-even point came - I think you could only buy five of these before matching the price of the whopper so I stuck with my three knowing I had 'overpaid' but still hadn't spent the another five pounds (or so?) on paint which would just be chucked away at some point.
I opened them today and this is what 50ml looks like:
.... well under half of the pot! My other half immediately, of course, said, "Well you didn't think a pot that size was 50ml did you?" Well, yes, actually, I did. How am I supposed to know what 50ml looks like? If I buy a pot or jar of anything I don't expect it to be half full; what's so different about paint?